Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17c250e12abd69a…

MALICIOUS

PDF

71.7 KB Created: 2021-10-05 16:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e57640c1813d809ebb9644dea506abb1 SHA-1: e74786e191b868057638ec933a47293f77d0e585 SHA-256: b17c250e12abd69a44e36e89dbe508c65e5b74a68bb9e6e51e42ffce793e6af0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm or distribution point for further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using many distinct hosts with few links per host, a common tactic for SEO manipulation or evading detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://everest-c.ru/ckfinder/userfiles/files/31195257966.pdf In PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/rurosuwesawipuvo.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/81upvjgtug5ntkvcg01vdp4880/zepofutikul.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/wegilupagavasozodegax.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/12531282494.pdfIn PDF document text
    • http://cochemical.com/upload/files/75565486857.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/23889742911.pdfIn PDF document text
    • https://webmanagement.produse-electrice.ro/images/file/vixobamatuzabokadopas.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/benofujit.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307c601e224---rodofetu.pdfIn PDF document text
    • https://computerzone.pk/file/kinixewajuzomaros.pdfIn PDF document text
    • https://unaizahic.com/Files/files/69186673796.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/gifawukobaledaribidukus.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/wanikiruwixokamejasofez.pdfIn PDF document text
    • https://12shio3.com/contents/files/posizizobem.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/84878168793.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/jevabaziritepif.pdfIn PDF document text
    • https://msiutilities.net/documents/22154901954.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/fadebobulexededigov.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/56430949469.pdfIn PDF document text
    • http://rayanchem.com/d/files/94865622470.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/puxowunejewuxug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+many+shots+of+tequila+is+too+muchPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44A 10936 bytes
SHA-256: 838a6fab6fd072fda992f6fa70bacc2eed355a37a39770e412e812f9e5947e22
font_01_sfnt_off0000cd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7E 16964 bytes
SHA-256: aa8cfa25140e3eef0440de4acf368a2e08bd7cf839e1c98b3ea090af1ce0ed1f
font_02_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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